Lead-cable press



moct. 30, 1928.

- P. WlEGHARDT LEAD CABLE PRESS Filed Dec. 51, 1925 M wa lw a 5w Fig. 1

Fig.2

Patented Oct. 30, 1928.

UNITED STATES PAUL WIEGHARDT, or

MAGDEBURG, GERMANY, ASSIGNOR TO THE FIRM FRIED.

KRUIPP GRUSONWERK AKTIENGESELLSCHAFT, OF MAGDEBURG-BUCKAU, GER- MANY.

LEAD-CABLE PRESS.

Application filed December 31, 1926, Serial No. 158,367, and in Germany February 6, 1926.

This invention relates to lead cable presses and in particular to means for the screwing in and. out of the tool holders, a movement performed hitherto by means of either large spanners placed on the head of the tool holder or special devices operated by hand or by power. Iniwiew of the considerable resist ance which the lead exposed to high pressure opposes to the insertion of the tool, it is necessary to use heavy and long spanner-s which are unwieldy to handle, whereas when special devices are employed a great ratio of transmission is required which results in a complicated construction and substantially increases the cost of the device.

According to this invention these drawbacks are avoided by deriving the rotary motion for the screwing in or out of the tool holder from the means employed to operate 2 the press. The actual devices which are used. for the purpose may vary according to the different known t pes of lead cable presses, whether horizontaf or vertical in construction.

In order that the invention maybe clearly understood and readily carried into effect it will now be described more fully by reference to the accompanying drawing which illustrates by way of example its application to a vertical lead cable press, and in which Figure 1 represents a side elevation partly in section and Figure '2 is a section on the line AB of Figure 1. v

The press shown comprises substantially a press frame 1, supporting a cylinder 2,having a ram or plun er 3, fitted with a table plate 4 and a press head 5 mounted on it and provided with tool holders 6 and 7 carrying respectively a mandrel 8 and matrix 9, a lead holder or receiver 10 and a plunger 11 completingthe known features of the press. The plunger is shown in its lowest position, that 1s to say in'the filling position.

' For the purpose of sheathing or covering "a cable 12, which is carried through the inandrel holder 6 and the mandrel 8 in the direction of the arrow 00, liquid under pressure is admitted under the plunger 3, which, together with the press head 5 and the lead holder 10. is raised, so that the plunger 11 forces the lead out of the holder 10 to form a covering 13 enclosing the cable. After the "lead filling has been expressed the space under the plunger 3, which is now in the upper position, is connected, by a suitable setting of the hydraulic valve gear, to exhaust and liquid under pressure is supplied to the annular space above the plunger, which is offset at the top, thus depressing it as well as the-press head 5 and lead holder 10. After the lead holder has been filled.

again with liquid lead and the latter has solidified, the process is repeated.

Regulation of the thickness of wall of the lead covering or sheath is carried out by the adjustment of the mandrel holder 6, which according to this invention is effected asfollows :The tool holder 6 is fitted with a lever 14 the outer end of which is connected, by the insertion of a pin 15 in one of a series of holes 16, to a bar 17 pivoted to the press frame. In the lever 14 grooves 18 are out each of which may form, with a groove of the tool holder 6, an insertion hole for a coupling pin 19, which, however, during the process of pressing, is withdrawn.

When it is desired to rotate the tool holder 6 the coupling pin 19 is inserted, the lever 14 is connected by means of the pin 15 to the bar 17, and rotation in the direction of the arrow 51/ will occur during the descent of the plunger 3 and in the opposite direction during its ascent. It is thus possible, according as the connection between the lever 14, tool holder 6 and bar 17 is made during the ascent or descent of the plunger 3, to screw, by means of the hydraulic drive of the press, the tool holder out of or into the press head 5, and in this way to regulate the thickness of wall of the lead cover or sheathing. On the circumference of the tool holder 6, in place of a single groove, several could be arranged, preferably at a distance apart different from the'pitch of the grooves provided in the bore of the lever 14.

As already stated, a similar device could be used for the screwing in student of the matrix holder 7 which, as is known from experience, becomes fixed in an extremely firm manner after the pressing is finished. In place of the lever 14 a gear wheel could be mounted on the tool holder adapted to mesh with a toothed rack fitted to the frame in such a manner as to be laterally movable into or out of engagement with the gear wheel: when engaged, the gear wheel will roll on the rack, on movement of the plunger 3, and in this way produce rotation of the tool holder. The gear wheel and the toothed rack could be rmanently in mesh, the rack being fixed, an the gear wheel coupled to the tool holder by a pin 19 or in a similar way to that described for the construction illustrated. In the case of hydraulic actuation Working in a different manner or of I mounted on the tool holder, and hence the tool holder itself. In all cases, however, it is essential for the invention. that-the operating power of the press be utilized for the setting or adj ust-ing of the tool holder.

The term lever is used in the claims in its broadest sense covering any member which may be coupled to the tool holder so that a force can be applied to the member to rotate the tool holder.

What I claim is:

1. In a lead cable press having a tool holder adjust-able by rotational movement, a lever coupled to said tool holder, and means for coupling the opposite end of said lever to a part of the press between which and said tool holder there is relative motion during the normal operation of the press.

2. In a lead cable press having a tool holder adjustable by rotational movement, alever, means for coupling said lever to said tool holder at "arious anglesand means for coupling the opposite end of said lever to a part of the press between which and said tool holder there is relative motion during the normal operation of the press.

3. In a lead cable press having a tool holder adjustable by rotational movement, a lever coupled to said tool holder, a member pivoted to a part of the press between which and said PAUL WIEGHARDT. 

